from Opie oils:
Castrol EDGE Turbo Diesel 5W-40 has been developed to meet VW & Audi Diesel specifications (VW 505 01). It is especially designed for use in VW TDI engines using Electronic Unit Injectors (Pumpe Duse).
This product should not be used in PD models equipped for VW Longlife extended service intervals (indicated by letters QG1 on the VIN plate - see handbook for details) as Castrol EDGE 5W-30 contains the specifications for these vehicles
(504 00, 507 00).
This product is recommended for Oil Drain Intervals of 15,000km or annual change.